<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .xiahuaxian {
            text-decoration: underline;
        }
        .shanchuxian {
            text-decoration: line-through;
        }
        .shanghuaxian {
            text-decoration: overline;
        }
        .sbxiahuaxian {
            text-decoration: none;
            /* 可用于删除链接的下划线 */
        }
        .yanse {
            color: yellow;
        }
    </style>
</head>
<body>
    <p class="xiahuaxian">下划线</p>
    <p class="shanchuxian">删除线</p>
    <p class="shanghuaxian">上划线</p>
    <a href="https://www.mi.com" class="sbxiahuaxian yanse" target="_blank">mi</a>
</body>
</html>